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Peanut allergy
Overview
Peanut allergy involves an immune or inflammatory reaction. Reactions range from local discomfort to anaphylaxis, which is a medical emergency.
Symptoms and severity vary. This article supports informed care but cannot diagnose a child or replace advice from a qualified healthcare professional.
Signs and symptoms
Possible signs include hives, swelling, itching, vomiting, cough, wheeze, dizziness or a sudden change in alertness. Not every reaction includes a rash.
Age matters: babies and children with long-term conditions may become unwell more quickly, and a parent’s concern about a clear change in behaviour, breathing, drinking or alertness deserves attention.
Causes
The immune system reacts to a trigger such as food, medicine, venom, latex or airborne allergen. Sensitisation and reaction patterns vary.
Risk factors
Personal or family history of allergy, asthma or eczema may increase likelihood. Previous mild reactions do not guarantee that a future reaction will remain mild. A risk factor raises likelihood but does not confirm that a child has the condition.
Diagnosis
Diagnosis relies on a precise history of timing, exposure and symptoms. Allergy tests can support selected diagnoses but must be interpreted with the history.
Tests are selected from the history and examination rather than used routinely for every child.
Treatment options
Avoidance of a confirmed trigger and a written action plan are central. Antihistamines treat some mild symptoms but do not replace adrenaline for anaphylaxis.
Use prescription and non-prescription medicines only as directed for the child’s age and weight. Aspirin should not be given to children unless a specialist specifically prescribes it.
Home care
Read labels, prevent cross-contact, tell caregivers and schools, and carry prescribed emergency medication. Review device technique and expiry dates regularly.
Encourage fluids, rest and comfortable clothing. Keep a note of symptom changes, medicines and fluid intake, and reduce spread through handwashing and condition-appropriate exclusion advice.
Prevention
Confirmed triggers should be avoided without unnecessarily excluding unrelated foods or products. Early allergen introduction follows age and individual-risk guidance.
Possible complications
A severe systemic reaction can affect breathing and circulation. Over-restriction without dietetic support can compromise nutrition.
When to seek urgent medical care
Use prescribed emergency medicine immediately for suspected anaphylaxis and call emergency services. Warning signs include breathing difficulty, throat or tongue swelling, collapse or rapidly progressing symptoms.
Call emergency services for severe breathing difficulty, blue or grey colour, collapse, a seizure, reduced responsiveness or signs of a rapidly worsening severe allergic reaction.
Frequently asked questions
Is this condition contagious?
Allergic and inflammatory skin conditions are not contagious. A separate infection can sometimes resemble or complicate them.
Can my child attend school or childcare?
Follow local public-health and school guidance. Keep a child home when they are too unwell to participate, have a fever, or need care the setting cannot safely provide.
When should symptoms improve?
The course depends on the cause and the child’s health. Arrange reassessment if symptoms worsen, new warning signs appear or recovery is not following the timeframe given by the clinician.
Summary
A clear diagnosis, practical trigger plan and appropriate treatment help children participate safely in everyday life.
References
OUR REVIEW PROMISE
Evidence-based, clearly reviewed.
Healthier Baby Today articles are reviewed for accuracy and updated as guidance changes.
Last updated: July 17, 2026
